Kim Kardashian's claws are out! The reality star and new mom to 2-month-old daughter North West put veteran journalist Katie Couric on blast on Friday, because, a source tells Us Weekly, she's simply had enough.

"Kim is so tired of people publicly bashing her yet kissing her ass behind closed doors," the source says. The reality star's younger sister Khloe Kardashian tweeted her support shortly afterward: "God I love this new side of u!"

On Friday, the "Keeping Up With the Kardashians" star shared a photo on her Instagram of a tiny pair of pajamas -- presumably for North -- along with a note from Couric. "Dear Kim and Kanye, Congratulations on the birth of your baby girl!" the card read. "And may I humbly suggest you continue the K tradition."

Kardashian, 32, mocked Couric's gift and note, responding with a series of hashtags: "Hate Fake Media Friends" and "May I Humbly Suggest You Not Send Gifts Then Talk Sh-t."

Kardashian's sudden outburst presumably stems from recent remarks that Couric made about the reality TV family. In the interview, the talk show host commented that she didn't understand why the Kardashians were famous.

In response to Kardashian's bold social media slam, however, Couric insists that she meant no harm.

"I've met Kim before and I think she's a really sweet person," Couric said in a statement to Us. "I was responding to a reporter's question, and explaining how I'm intrigued by the public's fascination with her family. I didn't mean to hurt her feelings. The gift is genuine, and I'm happy for Kim and Kanye."